WPF中的網格（或控件）的綁定邊距

Question

我想綁定一些控件的邊距，比如說一個按鈕：

<Window.Resources>
    <local:MarginConverter x:Key="marginConverter1"/>
</Window.Resources>

<Grid HorizontalAlignment="Left" VerticalAlignment="Top" 
      Margin="{Binding MyThickness, 
      Converter={StaticResource marginConverter1}}">
    <Button>Button1</Button>
</Grid>

根據參考。 在這里： SO：綁定部分頁邊距 ，我創建了MarginConverter類和MyDataContext類來實現INotifyPropertyChanged接口（請參見下文），但是Button1保留在左上角位置（好像其頁邊距為0）。

Public Class MyDataContext
   Implements INotifyPropertyChanged

   Private _myThickness As Thickness = New Thickness(20, 10, 20, 0)

   Public Event PropertyChanged As PropertyChangedEventHandler _
       Implements INotifyPropertyChanged.PropertyChanged

   Private Sub OnPropertyChanged(propertyName As String)
       RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName))
   End Sub

   Public Property MyThickness As Thickness
       Get
           Return _myThickness 
       End Get
       Set(value As Thickness)
           _myThickness = value
           OnPropertyChanged("MyThickness")
       End Set
   End Property
End Class

以及后面的代碼：

Dim myDataContext1 As New MyDataContext()
Private Sub Window1_Initialized(sender As Object, e As EventArgs) Handles Me.Initialized
   myDataContext1.MyThickness = New Thickness(20, 150, 20, 0)
End Sub

請幫助我澄清我的誤解，即使是基礎知識或您的清晰解釋也將不勝感激！

P / S： 我打算綁定上邊距的目的是當用戶執行某些特定任務時，窗口頂部將出現25個高度的邊框，因此所有現有控件都必須放下。 因此，如果您有其他方法，請在此處分享。 謝謝。

Answer 1

如果只想動態地在網格頂部提供25的高度，則可以通過在網格頂部添加一個邊框並將其可見性從“ Collapsed”更改為“ visible”來實現。

<Grid HorizontalAlignment="Left" VerticalAlignment="Top">
    <StackPanel>
    <Border Height="25"   Visibility="Collapsed">

    </Border>
    <Button >Button1</Button>
    </StackPanel>
</Grid>

Answer 2

好的，這里是您的工作示例，很抱歉，但僅適用於C＃app.xaml

  <Application.Resources>
    <ResourceDictionary>
            <viewModel:TestVM x:Key="TestVm"/>
    </ResourceDictionary>
  </Application.Resources>

視圖模型

public class TestVM : INotifyPropertyChanged
    {
        Thickness myThickness = new Thickness(20,10,20,0);

        public Thickness MyThickness
        {
            get { return myThickness; }
            set { myThickness = value; OnPropertyChanged(); }
        }




        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }

Window1.xaml

<Window x:Class="WPF_Test_Canvas_Chart.Windows.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WPF_Test_Canvas_Chart.Windows"
        mc:Ignorable="d"
        DataContext="{StaticResource TestVm}"
        Title="Window1" Height="300" Width="300">
    <Grid HorizontalAlignment="Left" VerticalAlignment="Top" 
      Margin="{Binding MyThickness}">
            <Button>Button1</Button>
        </Grid>

</Window>

Window1.cs

public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            var data = this.DataContext as TestVM;
            data.MyThickness = new Thickness(100,10,20,0);
        }
    }